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Instruction Book
Page 12
Effective: March 2007
S ECT IO N 4: I NST AL L AT IO N
WARNING
BEFORE PLACING THE BREAKER IN SERVICE,
CAREFULLY FOLLOW THE INSTALLATION
PROCEDURE GIVEN BELOW. NOT FOLLOWING
THE PROCEDURE CAN FAIL TO UNCOVER
SHIPPING DAM-AGE THAT MAY RESULT IN
INCORRECT BREAKER OPERATION LEADING TO
DEATH, BODILY INJURY, AND PROPERTY
DAMAGE.
4-1 INITIAL INSPECTION AND OPERATION
Before attempting to put the breaker in service, it should
be carefully examined and operated manually and
electrically.
Examine a breaker for loose or obviously damaged
parts.
4-2 SURE CLOSE MECHANISM ADJUSTMENT
WARNING
FOR ALL TYPE DHP 15 KV HOUSINGS EQUIPPED
WITH MECHANISM OPERATED CELL (MOC)
SWITCHES, THE STEPS OUTLINED IN THIS
PARAGRAPH MUST BE PERFORMED BEFORE
INSTALLING A REPLACEMENT DHP-VR CIRCUIT
BREAKER. FAILURE TO COMPLY COULD CAUSE
SEVERE PERSONAL INJURY, DEATH, EQUIPMENT
DAMAGE AND/OR IMPROPER OPERATION.
All 15 kV. Type DHP-VR Breakers utilize the DHP-VR
SURE CLOSE MECHANISM to control MOC velocity
and closely mimic the dynamics and velocities of older
breakers. It is imperative that this mechanism be
adjusted to match the number of MOC switches (from 0
to 3) mounted in the cell. If the adjustment is made on
the DHP-VR breaker to be compatible with one housing
with a given number of MOC switches, make sure the
adjustment is checked and compatible if the breaker is
moved to a different housing.
The breaker has been factory adjusted to operate one
mechanism operated cell (MOC) switch in the cell. This
means that for applications with either no MOC switch
or one MOC switch, no field adjustments are required.
It is only for the cases of 2 or 3 MOC switches that the
Courtesy of NationalSwitchgear.com
It is only for the cases of 2 or 3 MOC switches that the
drive spring adjustment is required. The adjustment is
done with the breaker out of the cell, open and all
springs discharged. Refer to Figures 4-1 through 4-6
for reference assistance.
Finally, the SURE CLOSE mechanism provides an
effective way to evaluate the condition of the MOC in
the cell. If the SURE CLOSE drive spring is properly
adjusted, but the MOC does not fully open or close, it is
time to maintain the MOC in the cell. Maintenance
usually means cleaning and lubricating the MOC
mechanism. If the MOC has seen a large number of
cycles, however, worn components may have to be
replaced.
To adjust the SURE CLOSE drive spring for a specific
number of MOC switches, proceed with the following
steps:
Step 1: Remove the right hand phase barrier from the
Step 2: Locate the MOC drive spring (Figure 4-1). It is
Step 3: From the factory, the drive spring comes set for
Step 4: Anytime an adjustment is made, use a
Step 5: Refer to Figures 4-5 and 4-6 to see the drive
Step 6: Any time an adjustment is made, make sure
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breaker (Figure 3-5).
located in the left lower portion of the breaker
as viewed from the top rear of the breaker with
the phase barriers removed.
0 or 1 MOC switch. Refer to Figure 4-2 to see
how that adjustment would look. Notice that
there is a nut and a jam nut on the threaded rod
to make the adjustment easy. Also notice that
a step gauge is provided and bolted next to
the spring to further simplify the adjustment
(Figures 4-2 and 4-3).
straight-edge to make sure that the flat
surface end of the spring is properly aligned
with the correct step on the gauge for the
number of installed MOC switches. Figure 4-4
shows the alignment being checked for one
installed MOC switch. Always refer back to the
graphic in Figure 4-3 to ensure adjustment of
the spring to the proper step on the gauge for
the number of installed MOC switches.
spring adjusted for 2 installed MOC switches
and 3 installed MOC switches respectively.
that all nuts are secured in place and double
check for proper adjust with a straightedge as
described in Step 4.
I.B6513C80G
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